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#ifndef OT_GLYF_GLYF_HELPERS_HH
#define OT_GLYF_GLYF_HELPERS_HH
#include "../../hb-open-type.hh"
#include "../../hb-subset-plan.hh"
#include "loca.hh"
namespace OT {
namespace glyf_impl {
template<typename IteratorIn, typename TypeOut,
hb_requires (hb_is_source_of (IteratorIn, unsigned int))>
static void
_write_loca (IteratorIn&& it,
const hb_sorted_vector_t<hb_codepoint_pair_t> new_to_old_gid_list,
bool short_offsets,
TypeOut *dest,
unsigned num_offsets)
{
unsigned right_shift = short_offsets ? 1 : 0;
unsigned offset = 0;
TypeOut value;
value = 0;
*dest++ = value;
hb_codepoint_t last = 0;
for (auto _ : new_to_old_gid_list)
{
hb_codepoint_t gid = _.first;
for (; last < gid; last++)
{
DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
*dest++ = value;
}
unsigned padded_size = *it++;
offset += padded_size;
DEBUG_MSG (SUBSET, nullptr, "loca entry gid %u offset %u padded-size %u", gid, offset, padded_size);
value = offset >> right_shift;
*dest++ = value;
last++; // Skip over gid
}
unsigned num_glyphs = num_offsets - 1;
for (; last < num_glyphs; last++)
{
DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
*dest++ = value;
}
}
static bool
_add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
{
hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source);
hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
hb_blob_destroy (head_blob);
if (unlikely (!head_prime_blob))
return false;
head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
head_prime->indexToLocFormat = use_short_loca ? 0 : 1;
if (plan->normalized_coords)
{
head_prime->xMin = plan->head_maxp_info.xMin;
head_prime->xMax = plan->head_maxp_info.xMax;
head_prime->yMin = plan->head_maxp_info.yMin;
head_prime->yMax = plan->head_maxp_info.yMax;
unsigned orig_flag = head_prime->flags;
if (plan->head_maxp_info.allXMinIsLsb)
orig_flag |= 1 << 1;
else
orig_flag &= ~(1 << 1);
head_prime->flags = orig_flag;
}
bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob);
hb_blob_destroy (head_prime_blob);
return success;
}
template<typename Iterator,
hb_requires (hb_is_source_of (Iterator, unsigned int))>
static bool
_add_loca_and_head (hb_subset_context_t *c,
Iterator padded_offsets,
bool use_short_loca)
{
unsigned num_offsets = c->plan->num_output_glyphs () + 1;
unsigned entry_size = use_short_loca ? 2 : 4;
char *loca_prime_data = (char *) hb_malloc (entry_size * num_offsets);
if (unlikely (!loca_prime_data)) return false;
DEBUG_MSG (SUBSET, nullptr, "loca entry_size %u num_offsets %u size %u",
entry_size, num_offsets, entry_size * num_offsets);
if (use_short_loca)
_write_loca (padded_offsets, c->plan->new_to_old_gid_list, true, (HBUINT16 *) loca_prime_data, num_offsets);
else
_write_loca (padded_offsets, c->plan->new_to_old_gid_list, false, (HBUINT32 *) loca_prime_data, num_offsets);
hb_blob_t *loca_blob = hb_blob_create (loca_prime_data,
entry_size * num_offsets,
HB_MEMORY_MODE_WRITABLE,
loca_prime_data,
hb_free);
bool result = c->plan->add_table (HB_OT_TAG_loca, loca_blob)
&& _add_head_and_set_loca_version (c->plan, use_short_loca);
hb_blob_destroy (loca_blob);
return result;
}
} /* namespace glyf_impl */
} /* namespace OT */
#endif /* OT_GLYF_GLYF_HELPERS_HH */
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